Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
An instrument of war; a light spear. "Fiery darts" (Eph. 6:16) are so called in allusion to the habit of discharging darts from the bow while they are on fire or armed with some combustible material. Arrows are compared to lightning (Dt. 32:23, 42; Ps. 7:13, 120:4).